From 278d91c4609d55202c1e63d5fc5f01466cc7bbab Mon Sep 17 00:00:00 2001 From: Akira Takeuchi Date: Wed, 27 Oct 2010 17:28:52 +0100 Subject: MN10300: Make the FPU operate in non-lazy mode under SMP Make the FPU operate in non-lazy mode under SMP so that when the process that is currently using the FPU migrates to a different CPU, we don't have to ping its previous CPU to flush the FPU context. Signed-off-by: Akira Takeuchi Signed-off-by: Kiyoshi Owada Signed-off-by: David Howells --- arch/mn10300/kernel/fpu-nofpu.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) create mode 100644 arch/mn10300/kernel/fpu-nofpu.c (limited to 'arch/mn10300/kernel/fpu-nofpu.c') diff --git a/arch/mn10300/kernel/fpu-nofpu.c b/arch/mn10300/kernel/fpu-nofpu.c new file mode 100644 index 00000000000..31c765b92c5 --- /dev/null +++ b/arch/mn10300/kernel/fpu-nofpu.c @@ -0,0 +1,30 @@ +/* MN10300 FPU management + * + * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public Licence + * as published by the Free Software Foundation; either version + * 2 of the Licence, or (at your option) any later version. + */ +#include + +/* + * handle an FPU operational exception + * - there's a possibility that if the FPU is asynchronous, the signal might + * be meant for a process other than the current one + */ +asmlinkage +void unexpected_fpu_exception(struct pt_regs *regs, enum exception_code code) +{ + panic("An FPU exception was received, but there's no FPU enabled."); +} + +/* + * fill in the FPU structure for a core dump + */ +int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpreg) +{ + return 0; /* not valid */ +} -- cgit v1.2.3-70-g09d2